Blown-In Insulation Costs?
On February 25, 2026 By newsroom Topic: Home Services
Average Costs:
- Per Square Foot:
- $0.50–$2.30 for materials.
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$3–$7.50 with installation for attics.
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By Area:
- Existing Walls: $1.75–$3.50 per sq. ft.
- New Homes (attics): $2–$4 per sq. ft.
- Attic Insulation (1,000 sq. ft.): $600–$1,200 (materials) or $3,000–$7,500 (installed).
Material Types & Costs:
- Fiberglass:
- $0.50–$1.10 per sq. ft.
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Affordable, moisture-resistant, and fire-resistant. R-value: 2.5–3.5 per inch.
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Cellulose:
- $0.60–$2.30 per sq. ft.
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Eco-friendly, but emits VOCs. R-value: 3.2–3.7 per inch.
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Rockwool (Mineral Wool):
- $1.40–$2.10 per sq. ft.
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Naturally flame and insect-resistant. R-value: 3.0–3.7 per inch.
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Natural Wool (Sheep’s Wool):
- $1.50–$3.10 per sq. ft.
- Ideal for cold climates, mold-resistant, and durable. R-value: 3.5–3.8 per inch.
Cost Factors:
- Size of the Area:
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Insulating a 1,000 sq. ft. attic costs $600–$1,200 (materials only).
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Labor:
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$40–$70 per hour. Labor makes up 30–60% of the total cost.
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R-Value:
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Higher R-values (insulation efficiency) cost more.
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Home Location:
- Costs vary by climate; colder regions require higher R-values and thicker insulation.
Additional Costs:
- Air Sealing: $300–$1,500 to seal gaps before insulation.
- Mold Remediation: $1,125–$3,345 to remove mold before installation.
- Asbestos Removal: $1,120–$2,910 if insulation contains asbestos.
DIY vs. Hiring a Pro:
- DIY Costs:
- Insulation bags: $30–$70 each (covers ~100 sq. ft.).
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Blowing machine rental: $100–$200 per day.
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Hiring a Pro:
- Saves time and ensures proper installation.
- Spot hazards like mold or asbestos.
Benefits of Blown-In Insulation:
- Easy and quick to install.
- Efficient for thermal regulation.
- Fire-resistant and insect-repellent.
- Reduces energy consumption and bills.
When to Replace or Add Insulation:
- Rising energy bills.
- Drafty rooms or uneven temperatures.
- Cold floors or frozen pipes.
- Insufficient soundproofing.
Blown-in insulation is a cost-effective and efficient way to keep your home cozy and energy-efficient!
FAQs About Blown-In Insulation
- Is blown-in insulation worth it?
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Answer: Yes, for many homeowners! Blown-in insulation is efficient, easy to install, and provides excellent thermal regulation. Most types are mold-resistant, flame-resistant, and insect-resistant, making them safe and durable.
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How long does blown-in insulation last?
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Answer: Typically 20 to 30 years, depending on the material.
- Cellulose & Sheep’s Wool: Up to 30 years.
- Fiberglass & Rockwool: Up to 50+ years, as long as no significant issues like flooding or mold occur.
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Should I remove old insulation before adding blown-in insulation
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Answer: It depends:
- If the old insulation is decades old or harbors mold, insects, or mildew, it’s best to remove it.
- Otherwise, you can usually add blown-in insulation on top of pre-existing materials after ensuring the space is clean and safe.
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Is blown-in insulation cheaper than spray foam?
- Answer:
- Blown-in insulation: Costs $0.50–$2.30 per square foot on average.
- Spray foam: Costs $1–$2 per square foot but typically requires professional installation.
- Verdict: Blown-in insulation has a lower starting cost, but spray foam may offer better long-term performance for specific applications.
For further details on materials, costs, and tips, feel free to ask!
